Review: Jay Cooke is a spectacular park, with scenery and lots of trail, mostly off limits to bikes. There's a little over 6 miles of good Double track open to us, connected to paved rail trail. Greely is pretty tame. Triangle and especially lower Triangle is the most demanding. Still all wide douple track but with steeps going both ways. Only the strongest climbers will clean this, and it's for sure a work out. Oak trail (there seem to be a few oaks amid the birch) is a quick loop with some significant elevation change, but at fairly sedate grades. Just a few miles from the big road and Black Bear casino. worth a side trip.